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STOCK-BASED COMPENSATION - Summary of Stock Option Activity (Details) - Stock Options
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
$ / shares
shares
Shares    
Outstanding (in shares) | shares 3,028,000 3,238,000
Exercised (in shares) | shares 0 (202,000)
Forfeited/Expired (in shares) | shares (29,000) (37,000)
Outstanding (in shares) | shares 2,999,000 2,999,000
Vested and expected to vest at period end (in shares) | shares 2,999,000 2,999,000
Exercisable at period end (in shares) | shares 2,650,000 2,650,000
Weighted Average Exercise Price    
Outstanding (in dollars per share) | $ / shares $ 62.44 $ 60.86
Exercised (in dollars per share) | $ / shares 0 38.02
Forfeited/Expired (in dollars per share) | $ / shares 62.74 57.67
Outstanding (in dollars per share) | $ / shares 62.43 62.43
Vested and expected to vest at period end (in dollars per share) | $ / shares 62.43 62.43
Exercisable at period end (in dollars per share) | $ / shares $ 62.42 $ 62.42
Weighted Average Remaining Contractual Term in Years    
Outstanding (in years) 4 years 6 months 25 days  
Vested and expected to vest (in years) 4 years 6 months 25 days  
Exercisable at the end of the period (in years) 4 years 2 months 19 days  
Aggregate Intrinsic Value    
Outstanding at period end | $ $ 0 $ 0
Vested and expected to vest at period end | $ 0 0
Exercisable at period end | $ $ 0 $ 0